Erard Action Diagram...again! Sorry if it's a repeat

[David Nereson]

Piannaman@aol.com wrote:

>  Hi all,
>  
> Sorry if this is a rerun.  Didn't seem to go through the first time!
>  
> I dug out a diagram of the Erard action that I'm trying to get a 
> handle on.  Any suggestions on regulation of this would be welcomed!  
> Quentin and Pierre have been most helpful.
>  
> I don't know if the 1821 on the diagram is the year this action was 
> patented or not.  I can only assume that it is. 
>  
> Curious animal, that's for sure.
>  
> Dave Stahl

    The main difference I see is in the damper mechanism.  Other 
regulation procedures such as jack alignment to knuckle, repetition 
lever height, hammer blow distance, let-off, drop, and repetition spring 
strength ("hammer rise") should be fairly straightforward.   I can't 
quite figure out the backchecking, and it looks like there's some sort 
of "sticker" that connects the wippens to the keys, instead of the 
wippen just sitting on a capstan screw.  Is that an adjustable dowel or 
button on the lower end of the sticker?   So those things you'll have to 
figure out, but with a little detective work and experimentation, it 
shouldn't be all that much different from a more modern action with 
similar wippens..  There are stranger animals out there. 
    --David Nereson, RPT